<style>
    body {
        background: #efefef;
    }
</style>
<div>

    <!--pad端显��end-->
    <div class="visible-sm visible-xs menu_box">
        <span></span>
    </div>
    <div class="menu" id="menu_id">
        <wit-menu></wit-menu>
    </div>
    <div class="visible-md visible-lg">
        <span></span>
    </div>



</div>